When he was so far out that he could look back not only on the little bay but past the promontory that was between it and the bigbeach, he floated on the buoyant surface and looked for his mother.

Doris Lessing -- Through the Tunnel

Captain Flume had entered his bed that night a buoyant extrovert and left it the next morning a brooding introvert, and Chief White Halfoat proudly regarded the new Captain Flume as his own creation.

Joseph Heller -- Catch-22

Evasion I felt oddly buoyant as I walked form Spanish toward the cafeteria, and it wasn’t just because I was holding hands with the most perfect person on the planet, though that was certainly part of it.